Microcomputer control cabinet based on PAC (programmable automation controller) technology for AC (alternating current) transmission motor vehicle

The utility model discloses a microcomputer control cabinet based on the PAC (programmable automation controller) technology for an AC (alternating current) transmission motor vehicle, which is characterized in that: the microcomputer control cabinet comprises a CPU (central processing unit) control unit and a plurality of I/O (input/output) plug-in units, wherein the I/O plug-in units are respectively connected with the CPU control unit; each I/O plug-in unit comprises an analog quantity input module, a frequency quantity collecting module, an analog quantity output module, a digital quantity input module, a digital quantity output module, a communication module, a closed loop control module, a power driving module and a communication module; and the power driving module is connected with the digital quantity input-output module. The rotating speed of a diesel engine is controlled through the outputting of standard analog quantity signals so as to realize smooth lifting transition and stable rotating speed of the diesel engine; meanwhile, contact electrical appliance control and circuit part of a control circuit are replaced by logic control, so that the structure of the control circuit is simplified and fault points are reduced.